package cn.tedu.sp11.fallback;

import cn.tedu.web.util.JsonResult;
import com.sun.org.apache.bcel.internal.generic.RETURN;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.http.server.reactive.HttpHandler;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFB implements FallbackProvider {
    /*
    返回 service-id
    针对哪个服务进行降级

    "*"   - 针对所有服务进行降级
    null  - 针对所有服务进行降级
     */
    @Override
    public String getRoute() {
        return "item-service";
    }

    /*
    设置向客户端返回的降级响应
     */
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }
            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }
            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                // JsonResult - {code:200, msg:"调用后台商品服务失败", data:null}
                String json = JsonResult.ok().msg("调用后台商品服务失败").toString();
                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders header = new HttpHeaders();
                header.add("Content-Type","application/json;charset=UTF-8");
                return header;
            }
        };
    }
}